Answer : Interior design is important for a number of reasons. First, it can impact the function of a space. A well-designed room will be organized and efficient, while a poorly designed one may be cluttered and inefficient. Second, interior design can affect the mood of those who use the space. A well-designed room may be calming and relaxing, while a poorly designed one may be stressful and irritating. Third, interior design can impact the perceived value of a space. A well-designed room will be seen as more valuable than a poorly designed one. Finally, interior design can have an environmental impact.